EP 0474430 B1 19970514 - Flame monitoring method
Title (en)
Flame monitoring method
Title (de)
Verfahren zur Flammenüberwachung
Title (fr)
Dispositif de contrÔle de flammes
Publication
Application
Priority
GB 9019457 A 19900906
Abstract (en)
[origin: EP0474430A1] The presence of a burner flame, in a multiple burner installation, is monitored by sensing a signal indicative of the spectrum of the fluctuating component in the radiation of the flame over a range of frequencies. In the lower frequency range a measure (D1,D2) is obtained of the difference of signal strength at two predetermined frequency levels (L,LL). The signal strength is also measured at a higher frequency (H). At the higher frequency there is a significant difference in signal intensity between the flame-on and flame-off conditions, while the change of signal strength between the spectra of flame-on and flame-off conditions in the lower frequency range is sensitive to frequency. By processing the two measures together they can augment each other and produce an enhanced change of signal between flame-on and flame-off conditions, making detection easier. <IMAGE>
IPC 1-7
IPC 8 full level
F23N 5/08 (2006.01)
CPC (source: EP US)
F23N 5/082 (2013.01 - EP US); F23N 2229/08 (2020.01 - EP US); F23N 2229/22 (2020.01 - EP US); F23N 2237/02 (2020.01 - EP US)
Citation (examination)
P. M. WILLSON AND T. E. CHAPPELL: 'PULVERISED FUEL FLAME MONITORING IN UTILITY BOILERS'
Designated contracting state (EPC)
GB
DOCDB simple family (publication)
EP 0474430 A1 19920311; EP 0474430 B1 19970514; AU 639597 B2 19930729; AU 8362091 A 19920312; GB 9019457 D0 19901024; US 5191220 A 19930302
DOCDB simple family (application)
EP 91307889 A 19910828; AU 8362091 A 19910905; GB 9019457 A 19900906; US 75118091 A 19910828